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Square collar designed for 20” × 20” duct
950 Series Engineering/Performance Data
Ceiling opening must be 4” larger in length and width than the nominal duct size
Zinc plated steel closure spring
Negator stainless steel closure springs mounted on spring pin brackets
Volume Damper Low-Leak OBD 3000-0BDLL-50X50 Step Down Ceiling Diffuser Square collar designed for 20”h3. Standard Features * Opposed blade operation for precise volume control * 16 gauge galvanized channel frame * Blades are vee stiffened 16 gauge galvanized for strength and stability * Blades pivot on non metallic celcon bushings * 1 2" square zinc plated steel pivot pins * 1 2" square zinc plated steel adjustable operating shaft extending up to 4" beyond the air control frame * Single blades on dampers with a height of 12" or less * Mill finish h3.
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